Rubber composition and steel cord-rubber composite body

Abstract

A particular organic boron compound is compounded with rubber or applied to the surface of the steel cord in order to improve the resistance to corrosion fatigue of steel cord as a reinforcement for rubber articles with holding good adhesion properties to rubber.

What is claimed is: 
     
       1. A steel cord-rubber composite body produced by adhering rubber to steel cord and vulcanizing it, characterized in that a rust preventive treating agent consisting of at least one organic boron compound represented by the following general formula: ##STR3## wherein each of R 1 , R 2  and R 3  is an alkyl group having a carbon number of 7˜21 and may be substituted with a hydroxyl group, is formed as a protective layer on the surface of the steel cord. 
     
     
       2. The steel cord-rubber composite body according to claim 1, wherein said organic boron compound is selected from glycerol borate laurate, glycerol borate palmitate, glycerol borate stearate, glycerol borate oleate, glycerol borate isostearate and glycerol borate hydroxystearate. 
     
     
       3. The steel cord-rubber composite body according to claim 1, wherein said organic boron compound is dissolved in a solvent and then applied to said steel cord to form said protective layer on the surface of said cord. 
     
     
       4. The steel cord-rubber composite body according to claim 3, wherein said protective layer has a thickness of 20 μm at maximum.